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The National Transportation Safety Board issued another update on Friday of its investigation into the Boeing Dreamliner 787. "Our investigators are moving swiftly and we are making progress," said Kelly Nantel, an NTSB spokeswoman.

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The National Transportation Safety Board will continue to question Boeing executives about the approval of the battery aboard the Boeing 787. "We used the state of the art in the industry at the time," said Mike Sinnett, a Boeing vice president and the chief engineer for the 787. Meanwhile, the European Aviation Safety Agency approved Boeing's battery fix for the 787 on Tuesday.

The National Transportation Safety Board is looking at microscopic dendrites as a source of battery failure for the Boeing 787. Dendrites are small deposits of lithium that can grow inside lithium-ion batteries from rapid or uneven charging, experts say. Boeing declined to comment.

Deborah Hersman, head of the National Transportation Safety Board, said the agency would not "categorically" rule out lithium-ion batteries for aviation. The U.S. safety agency is investigating the cause of a battery fire aboard the Dreamliner 787.

Deborah Hersman, chairman of the National Transportation Safety Board, said Thursday that the safety agency was just getting started on its probe of issues with Boeing 787 Dreamliners. "We are early in our investigation, we have a lot of activities to undertake," said Hersman.

The National Transportation Safety Board has yet to come to a conclusion of the cause of issues with the Boeing Dreamliner 787. "As far as design of the aircraft, there are multiple systems to protect against a battery event like this. Those systems did not work as intended," said NTSB chief Deborah Hersman.